Multiple choice

Among the following complexes, the largest crystal field splitting occurs in

  1. [CrCl6]3-

  2. [Cr(H2O)6]3+

  3. [Cr(NH3)6]3+

  4. [Cr(CN)6]3-

  5. [Cr(en)3]3+
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D Correct answer
Explanation

The oxidation state and the strength of the ligands determine the extent of crystal field splitting. The higher the oxidation state or the stronger the ligand, the larger will be the splitting. Ligands are classified as strong or weak based on the spectrochemical series: I- < Br- < Cl- < SCN- < F- < OH- < ox2-< ONO- < H2O < SCN- < EDTA4- < NH3 < en < NO2- < CN- CN-  is among one of the strongest field ligands. Crystal field splitting will be the highest in [Cr(CN)6]3-.

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